Automatic trigger exposure circuit of flat panel detector

Abstract

The invention provides an automatic trigger exposure circuit of a flat panel detector. The automatic trigger exposure circuit comprises photoelectric sensors of a plurality of parallelly-connected photoelectric reception diodes, a positive input end, a negative input end, a secondary operational amplifying circuit and a comparison circuit. The positive input end and the negative input end are connected to the photoelectric sensors and used for respectively connecting positive electrodes and negative electrodes of the photoelectric sensors into a primary operational amplifier and performing differential amplification to electrical signals of the photoelectric sensors, the secondary operational amplifying circuit is connected to the primary operational amplifier and used for performing amplification in the same direction to a voltage signal output by the primary operational amplifier, and the comparison circuit is connected to the secondary operational amplifying circuit and used for comparing the voltage signal output by the secondary operational amplifying circuit and reference voltage and outputting a pulse signal for controlling exposure of the flat panel detector when the voltage signal is larger than the reference voltage. The automatic trigger exposure circuit adopts a mode that plurality of photoelectric reception diodes are parallelly connected, can also finish exposure control under very low exposure dose, has very high sensitivity, adopts differential amplification and can effectively reduce interference of a system to the signals output by the photoelectric sensors and improve signal to noise ratio.

Description

technical field [0001] The invention belongs to the field of medical electronics, in particular to a flat panel detector automatic trigger exposure circuit. Background technique [0002] Since the launch of the first flat panel detector (flat panel detector) equipment in 1995, with the rapid development of flat panel detection technology in recent years, many manufacturers and researchers have brought flat panel digital X-ray detectors from the laboratory to the clinic In use, due to the advantages of high sensitivity, wide dynamic range and low distortion of digital images of flat-panel detectors, hospital users are increasing, and flat-panel technology is gradually becoming popular. The backbone of the revolution. [0003] In the development and production process of flat-panel detectors, flat-panel detection technology can be divided into two categories: direct and indirect. In recent years, flat-panel detection technology has made great progress. Due to the complexity ...

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a flat panel detector automatic trigger exposure circuit, which is used to solve the problem that the flat panel detector automatic trigger exposure circuit in the prior art has weak photosensitive ability under small dose exposure. , The output current is too small and the sensitivity is low

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